The Hydra monster from Disney's Hercules. Just a heads up that it's really hard to get this character's body right, so it's highly unlikely that it'll turn out correct if you want to show it's full body. I have been able to make it come out, but it doesn't turn out great when the AI makes it happen. There aren't a lot of good shots from the movie to get the body accurate, but it'll work fine with close-ups, upper body/neck shots, or as a base character template to come up with whatever you want.

Positive Prompts: HDHC, furry, feral, scalie, serpent, purple body, purple scales, orange sclera, black eyes, fangs, sharp teeth, long neck

Extra: angry

For the multiple heads look put "hydra, 3 heads, multi head."

If you want try to get the full body showing put "armless, toe claws, 4 toes, 2 legs, long tail"

You can give the character an anthro look and the AI will surprisingly do well with that.